Baby Sleeper in TENCEL™ - Astro Explorers

Soft against the skin and quick to change at 3 a.m.

Rockets, astronauts, UFOs — and one very small space explorer about to fall asleep.

Forbes named these the best baby pajamas in 2025. The sleeper is the workhorse of the under-layer — soft against the skin, quick to change in the dark, and built to survive the laundry a newborn puts it through.

Material. TENCEL™ Lyocell with a touch of spandex for stretch. TENCEL™ is the wood-pulp fibre Lenzing spins in a closed-loop process that recycles 99% of its water and solvents, certified to OEKO-TEX Standard 100.

The print. Soft pink ground with multicolored rockets, astronauts, flying saucers, planets, moons, and small stars.

Construction. Fold-over cuffs cover the hands for the first few months — no mittens to lose — then fold back when the baby wants them free. A two-way zipper runs chin to ankle and opens from the bottom for diaper changes, the neckline is tagless, and the shoulder and crotch seams are reinforced where a sleeper gets pulled on and off twice a day.

Sleepers and sleep bags work together. The sleeper is the layer underneath — it isn't meant to provide the warmth on its own. Pair with a 1.0 TOG TENCEL™ Sleep Bag for a 69–75°F nursery, a 0.5 TOG muslin sleep bag for 75–81°F, or wear alone in a warm room above 75°F if the baby protests the sleep bag.

Why TENCEL™ for a sleeper. A sleeper is worn most nights and washed two or three times a week, so we match the fibre to the job: TENCEL™ Lyocell keeps its softness and shape through heavy laundering. Our muslin pieces answer a different brief — swaddles, crib sheets, and 0.5 TOG bags use Tanboocel® Bamboo Viscose for breathability in the heat.

Sizing. 0–3M, 3–6M, 6–9M, 9–12M, 12–18M, 18–24M. Size to current measurement. A sleeper that's too long bunches at the hands and ankles and rides up overnight.

Care. Machine wash cold and tumble dry low. Don't bleach, and don't iron the printed areas. TENCEL™ holds its surface through the two or three washes a week a baby's laundry demands.

Safety & certification. AAP safe-sleep compliant and tested to CPSC, CPSIA, and ASTM standards. The material is certified to OEKO-TEX Standard 100, and Loulou Lollipop is a Certified B Corporation.

Browse all TENCEL™ baby pajamas & TENCEL™ sleepers.

Free US shipping over $65. Free 30-day returns on unworn items in original packaging.

Part of the Big Dreams Sleep System. Sleepers and sleep bags in Astro Explorers are built to layer together through the night — same print, one system. Complete the set with the Tanboocel® Bamboo Viscose 0.5 TOG Sleep Bag and TENCEL™ 1.0 TOG Sleep Bag.